StumbleUpon is great for finding interesting stuff that is off the beaten path. A post here, a URL there and suddenly you find yourself reading some incredible content. The iPad is perfect for this type of browsing, but StumbleUpon’s tablet app was woefully inadequate until now.
iOS/Android: Previously mentioned time-passing, sometimes productivity-killing StumbleUpon has just released an iPhone and Android app, tailored specifically to a mobile browsing experience.